Last week my brother went to Bangaluru to attend the final interview at Indian Statistical Institute. Though country wide roaming for free of cost did not come, we find a way out for cheaper (almost free) communication mode.
I sent a sms to his BSNL no. asking to send me messages on facebook.
He is using BSNL 3G, which offers data roaming at no extra cost.
My mobile no. registered with facebook, and as he drops msg on fb to me, it instantly delivered to my mobile's inbox.
I replied to that no. and it goes to fb conversation.